CVE-2026-106458: Backstage is an open framework for building developer portals

Routine

MEDIUM 6.5WATCHLISTUPGRADEUPGRADE

CVE-2026-106458 is a medium-severity flaw (CVSS 6.5) affecting backstage\/plugin-catalog-backend-module-bitbucket-server, backstage. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Backstage is an open framework for building developer portals. From 0.4.0 until 0.5.15, the @backstage/plugin-catalog-backend-module-bitbucket-server package is affected by inconsistent repository filtering in bitbucket server catalog event updates. Deployments using event-driven updates in the Bitbucket Server catalog provider may ingest catalog locations from repositories that are excluded by the provider's configured project, repository, or ar

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-10-06
Last modified	2026-10-27

Publisher (CNA): GitHub, Inc. · Vendor: linuxfoundation

Last updated 2026-10-27 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-06 21:17 UTCPublished CVE record published
2026-10-27 20:42 UTCUpdated Record last modified

linuxfoundation backstage\/plugin-catalog-backend-module-bitbucket-server UPGRADE

Affected: >= 0.4.0 and < 0.5.15

Fixed in: 0.5.15

Safe to downgrade to: a release before 0.4.0

1. Check installed version

npm ls backstageplugin-catalog-backend-module-bitbucket-server

2. UPGRADE to 0.5.15

npm install backstageplugin-catalog-backend-module-bitbucket-server@">=0.5.15"

3. If no update is available yet, DOWNGRADE to a release before 0.4.0

npm view backstageplugin-catalog-backend-module-bitbucket-server versions npm install backstageplugin-catalog-backend-module-bitbucket-server@"<0.4.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

linuxfoundation backstage UPGRADE

Affected: >= 1.38.0 and < 1.55.0

Fixed in: 1.55.0

Safe to downgrade to: a release before 1.38.0

1. Check installed version

apt-cache policy backstage || rpm -q backstage || backstage --version

2. UPGRADE to 1.55.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade backstage

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade backstage

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.38.0 (Debian / Ubuntu)

apt-cache madison backstage sudo apt install backstage=<VERSION_BEFORE_1.38.0> sudo apt-mark hold backstage

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list backstage sudo dnf downgrade backstage-<VERSION_BEFORE_1.38.0> sudo dnf versionlock add backstage

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-106458?

backstage\/plugin-catalog-backend-module-bitbucket-server: upgrade to 0.5.15; backstage: upgrade to 1.55.0. Exact commands for each OS are on this page.

Is CVE-2026-106458 being exploited?

CVE-2026-106458 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-106458 affect?

CVE-2026-106458 affects backstage\/plugin-catalog-backend-module-bitbucket-server, backstage. Severity is medium (CVSS 6.5). Backstage is an open framework for building developer portals. From 0.4.0 until 0.5.15, the @backstage/plugin-catalog-backend-module-bitbucket-server package is affected by inconsistent repository filtering in bitbucket server catalog event

How urgent is CVE-2026-106458?

Priority 32/100. On your watchlist

Software pages

Bitbucket vulnerabilities

References

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